This dissertation, "Mechanics of Viscoelastic Mud Under Water Waves" by Xueyan, Zhang, 張雪岩, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of the thesis entitled Mechanics of Viscoelastic Mud under Water Waves Submitted by XUEYAN ZHANG for the Degree of Master of Philosophy at the University of Hong Kong July 2006 Abstract This thesis consists of two parts. In the first part, a laboratory study is pre- sented on the rheological measurements of natural muds. Natural muds dredged from Haihe River in Tianjin and Mazhou Island in Shenzhen are tested in the laboratory using a Brookfield R/S rheometer. The controlled shear stress mode is adopted for measuring the yield stress by collecting data of low shear rates -1 γ˙ DOI: 10.5353/th_b3671000 Subjects: Fluid dynamics Mudflows Water waves